Sounds like a bug to me - the documentation doesn't say anything about null or empty not being allowed, so throwing NPE from somewhere inside isn't cool.
On 01/03/2013, at 8:21 PM, Lance Java wrote: > I'm going to guess that you're using DefaultTreeModel. There are 2 > constructors: > > public DefaultTreeModel(ValueEncoder<T> encoder, TreeModelAdapter<T> > adapter, T root) > and > public DefaultTreeModel(ValueEncoder<T> encoder, TreeModelAdapter<T> > adapter, List<T> roots) > > If your tree is null, then you have no roots. Don't pass null to the first > constructor because this will create a list with 1 null element in it (which > is probably causing your NPE). Instead, pass Collections.emptyList() (or > possibly null) to the second constructor. > > > > -- > View this message in context: > http://tapestry.1045711.n5.nabble.com/NPE-in-Tree-when-I-dont-have-any-data-tp5720289p5720296.html > Sent from the Tapestry - User mailing list archive at Nabble.com. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org > For additional commands, e-mail: users-h...@tapestry.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org For additional commands, e-mail: users-h...@tapestry.apache.org
